Routing error with confirmed (seemingly) existing route - ruby-on-rails

Question

I'm copying what seems to be identical logic, but it doesn't work with one of my models.
In surveys, I have
View
<% #surveys.each do |survey| %>
...
<%= link_to 'Delete', survey, :confirm => 'Are you sure?', :method => :delete %>
<% end %>
Controller
def destroy
#survey = Survey.find(params[:id])
#survey.destroy
respond_to do |format|
format.html { redirect to '/' }
format.json { head :no_content }
end
end
The delete function works fine.
Yet in question, I have
View
<% #questions.each do |question| %>
...
<%= link_to 'Delete', question, :confirm => 'Are you sure?', :method => :delete %>
<% end %>
Controller
def destroy
#survey = Survey.find(params[:survey_id])
#question = Question.find(params[:id])
#question.destroy
respond_to do |format|
format.html { redirect to #survey }
format.json { head :no_content }
end
end
This gives me the error:
undefined method `question path' for #<#<Class:0x008ff2534....
When I remove the link_to, it works just fine retrieving question and its properties.
Changing the logic in my view to something more specific,
<%= link_to "Delete", :controller => "questions", :action => "destroy", :id => question.id %>
I get a more specific error.
No route matches {:controller=>"questions", :action=>"destroy", :id=>1}
Running rake routes, this confirms the path exists.
DELETE /surveys/:survey_id/questions/:id(.:format) questions#destroy
And here's my routes.rb entry:
devise_for :users do
resources :surveys do
resources :questions do
resources :responses
end
end
end
Computers don't make mistakes, so what did I do wrong?

Answer 1

questions are nested resources, so you should also pass survey to the path:
<%= link_to 'Delete', [#survey, question], :confirm => 'Are you sure?', :method => :delete %>
Assuming that you have set #survey variable.

Answer 2

Question is a nested resource under Survey so your route needs to reflect that. Note that in the rake routes output there's a :survey_id parameter as part of the route. It is required. Therefore your link needs to look like this:
<%= link_to "Delete", :controller => "questions", :action => "destroy", :survey_id => #survey.id, :id => question.id %>
Alternatively you can use Marek's path, namespacing the question resource:
<%= link_to 'Delete', [#survey, question], :confirm => 'Are you sure?', :method => :delete %>